Looks impressive, the continuous zoom is a very nice touch. Can it also be implemented on zooming out?

And here's a vote/request for continuous zooming in Map This!.

zooming in is not that hard to implement...
Basically, you just need to render current map tiles on to a plane and move it along z axis with GU..
Of course this would only work great with satellite imagery, since in regular maps road widths are a bit unproportional.. Zooming out would require keeping much bigger square in memory, which would affect the performance...

EDIT: Deniska this guy needs help onto his program. He isn't experienced enough to develop a gps version of his program. The PSP-290 is too difficult to implement he says. Because it uses a lot of memory.

A suggestion for GMDL:
maps.google.com will redirect your http request to an authenticate page. and gmdl seems can't work then. i found after submit the authenticate page, the web site will create a new authenticate cookie. if GMDL could get and copy this cookie into next http "GET" request, the downloading could continue.
i wrote a tools to do that. but it's not easy to use.
I hope in7ane could upgrade GMDL to do that. (maybe you have know above. )

Thanks for Deniska's Mapthis. i used your GPS model into my program.

my program devloped by C++, and used JGE++ ( it's a 2D engine for PSP game, was developed by a china guy). You could search and get its codes and demo. My program used different map model with Mapthis, so it could support whole world maps.

Hi Deniska,
Zoom out is no problem. you know, we just need to keep 3*2 tiles in memory and set the smallest scale more then
(float)PSP_SCREEN_H/256 while render the tiles.

i wrote a new tools mpk to package the map tiles. i think it's more easy to use than GPSFS format. It seems a simple file system. it could package or unpackage all files, not only for Mapthis.
The file loading speed is very quick. i can share my codes if you need it.

Actually i can't compile and run JGE++(codes is C++) successfully under PSP2.XX frame. i have no free time to do that. So i can't support Sony290 now. Do you know can i connect to PSP290 under 1.5 fram? i have no experence on PSP2.xx. Can you show me the related files about building a 2.xx program?

thanks very much.
i will finish an english version of my program later. And i hope you would like it.